An improved liquid vaporization and conditioning system, and associated method, for efficiently vaporizing a liquid sample for accurately determining the constituent components thereof providing enhanced flow rate, pressure and thermal control, the improvement including a combination of a resistance temperature detector, a sweeping bend to, an in-line thermal break, a flow buffering input manifold, enhanced multi-path heater vaporizer construction with four heater units, a vaporizer output mixing manifold and control elements providing a capability for partial shutdown in the event of compromised heating or flow anomalies without risk of flow loss/volume capacity beyond a permissible threshold and an improved, modular heat vaporizer enclosure.
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1. An improved vaporizer and conditioning system for liquid, including a liquid sample input, a vaporizer operable to receive a liquid sample and convert the received liquid sample into vapor gas that is passed to an accumulator tank operable to receive the vaporized sample and a heated pressure regulator for conditioning the accumulated vaporized sample outputted from the accumulator tank to reduce the pressure thereof for passage by at least a first vapor sample outlet path to a downstream analyzer, the improvement comprising, in sequence:
a) a resistance temperature detector unit in-line with the liquid sample input;
b) a sweeping bend located in-line and downstream of the resistance temperature detector unit;
c) a thermal break for minimizing heat energy transfer locate in-line and downstream of the sweeping bend;
d) a flow buffering input manifold located in-line and downstream of the thermal break, the flow buffering input manifold including a liquid sample input receiving chamber, splitting the liquid sample input in the receiving chamber into a plurality of outputs from the receiving chamber to reduce pressure drop and provide flow volume uniformity;
e) where the vaporizer includes a vaporizer housing containing a plurality of liquid sample inputs and vapor outputs corresponding to the plurality of outputs from the flow buffering input manifold and a heater cartridge unit associated with each of the plurality of liquid sample vaporizer inputs characterized by:
i) a heater cartridge with an upper end and a lower end, said heater cartridge including an elongated electrically powered heating element of a select length,
ii) a coil tubing segment having a select height greater than the elongated electric heater element select length to extend above thereof, and spiral wrapping with reduced spacing between turns, configured to increase the contact surface area of the coil tubing with the elongated electric heating element, and limit pressure drop across the coil tubing segment,
iii) a thermocouple, disposed below the coil tubing segment, and
iv) an output; and
f) an exit manifold incorporating a plurality of vapor inputs corresponding to the plurality of vapor outputs from the vaporizer housing, each vapor input including a shutoff valve to terminate vapor flow, said exit manifold including an interior vapor accumulator chamber to mix the respective plurality of vapor inputs into a common vapor output stream, and an output for the common output stream from the interior vapor accumulator, chamber, an exit manifold thermocouple associated with the exit manifold output stream and a shut off valve for preventing flow to the accumulator tank when a temperature anomaly is detected by the exit manifold thermocouple;
where the vaporizer housing includes: a back wall, a top wall, a bottom wall, an angled mounting plate defining a front edge, a back section affixed to the back wall proximate to the bottom wall, said mounting plate projecting at an acute angle from the back wall relative to the bottom wall, said mounting plate including at least one receiving slot formed in the front edge with a tapered slot extending therefrom for a select distance in the direction of the back section;
where each coil tubing segment includes a n elongated cylindrical passage of a defined diameter and a first length and a lower segment generally orthogonally disposed to the coil elongated cylindrical passage and where each electrically powered heating element has a diameter corresponding to that of the elongated cylindrical passage and the lower end of the heater cartridge projects through the receiving slot of the angled mounting plate; and
a releasable clamp for engaging the lower end of the heater cartridge to secure the heater cartridge to the mounting plate,
where a heater cartridge is removable by releasing the releasable clamp from the lower end of the heater cartridge and the mounting plate and sliding the heater cartridge from the coil tubing segment.
7. An improved vaporizer and conditioning system for liquid, including a liquid sample input, a vaporizer operable to receive a liquid sample and convert the received liquid sample into vapor gas that is passed to an accumulator tank operable to receive the vaporized sample and a heated pressure regulator for conditioning the accumulated vaporized sample outputted from the accumulator tank to reduce the pressure thereof for passage by at least a first vapor sample outlet path to a downstream analyzer, the improvement comprising, in sequence:
a) a resistance temperature detector unit in-line with the liquid sample input;
b) a sweeping bend located in-line and downstream of the resistance temperature detector unit;
c) a thermal break for minimizing heat energy transfer located in-line and downstream of the sweeping bend;
d) a flow buffering input manifold located in-line and downstream of the thermal break, the flow buffering input manifold including a liquid sample input receiving chamber from which the liquid sample input in the receiving chamber is split into a select number of outputs from the receiving chamber;
e) a vaporizer housing containing a select number of liquid sample vaporizer inputs and vaporized vapor outputs corresponding to the select number of outputs from the flow buffering input manifold, said vaporizer housing including a back wall, a top wall and a bottom wall where the top wall includes the select number of liquid sample vaporizer inputs and the bottom wall includes the select number of vaporized vapor outputs and an angled mounting plate defining a front edge and back section affixed to the back wall proximate to the bottom wall, said mounting plate projecting at an acute angle from the back wall relative to the bottom wall, said mounting plate including at least one receiving slot formed in the front edge with a tapered slots extending therefrom for a select distance in the direction of the back section;
f) a heater unit with atop portion, a bottom portion and an electrically powered elongated heating element disposed therebetween associated with each of the select number of liquid sample vaporizer inputs in the vaporizer housing, said electrically powered elongated heating element having a select length and select diameter;
g) a continuous length of tubing in the vaporizer housing, passing through a coil tubing segment having a select height greater than the electrically powered elongated heating element select length, and spiral wrapping with reduced spacing between turns, configured to increase the contact surface area of the coil tubing with the electrically powered elongated heating element and limit pressure drop, said coil tubing segment defining an elongated cylindrical passage of a diameter corresponding to the select diameter of the electrically powered elongated heating element, a lower segment generally orthogonally disposed to the elongated cylindrical passage, and a vapor output segment;
a thermocouple, disposed below the coil tubing segment; and
a releasable clamp for engaging the bottom portion of the heater unit to secure the heater unit to the mounting plate where the vapor output segment of the tubing passes through the tapered slot of the mounting plate to the respective vaporized vapor output in the bottom wall,
where the heater unit is removable by releasing the releasable clamp from the bottom portion and the mounting plate and sliding the heater unit from the bottom of the coil tubing segment;
h) an exit manifold incorporating a select number of vapor inputs corresponding to the select number of vaporized vapor outputs from the vaporizer housing, each vapor input including a shutoff valve to terminate vapor flow, said exit manifold including an interior vapor accumulator chamber to mix the respective select number of vapor inputs into a common vapor output stream, and and output for the common output stream from the interior vapor accumulator chamber and
i) an exit manifold thermocouple associated with the exit manifold output stream and a shut off valve for preventing flow to the accumulator tank when a temperature anomaly is detected by the exit manifold thermocouple.
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This invention relates generally to an improved system and method for the efficient vaporization and measurement of cryogenic liquid natural gas (LNG), has applicability to certain processing of non-cryogenic natural gas liquid (NGL), and most particularly, to vaporizing liquid natural gas samples extracted from a vessel for analysis.
This invention is concerned with the similar issues confronted by the systems described and disclosed in U.S. patent U.S. Pat. No. 7,484,404 and it and its progeny and U.S. Patent U.S. Pat No. 8,056,399 and its progeny. LNG is produced by taking natural gas from a production field, removing impurities, and liquefying the natural gas. In the liquefaction process, the gas is cooled to a temperature of approximately −162° C. (−260° F.). One volume of this condensed, cryogenic liquid form of natural gas occupies about 1/600th of the volume of vaporized natural gas. Typically, natural gas will be converted to the liquid form for loading and transport or conveyance through or to a vessel. Pipelines, storage tanks, transport vehicles all comprise vessels for containing natural gas. By way of example, LNG is loaded onto ships for transport to a receiving facility where it is off-loaded typically into storage tanks. In this process, particularly in the context of custody transfer, accurate analysis of the constituents and energy value (BTU value) is crucial because the BTU value/constituents of a shipment is subject to change in transit due to, for example, evaporation.
An important part of accurate analysis in gas sample conditioning implicates the process of vaporization of a liquid sample extracted via a probe from a gas containing vessel, e.g., a pipeline. Once the liquid sample is extracted, it is typically communicated from the take-off probe through a corrosion-resistant super alloy, such as stainless-steel tubing, with a relatively small diameter to a sample conditioner for vaporization, pressure regulation, and ultimately to an analyzer, such as a chromatograph, for analysis.
When the extracted liquid sample is vaporized, the vapor stage is subject to substantial pressure reduction to a relatively low-pressure zone, e.g., 10-30 psig (68.9 kPa-206.8 kPa), which is an acceptable pressure for a typical analyzer/chromatograph. During the entire liquid to vapor process, it is important to prevent pre-vaporization and to maintain the vapor at a temperature and pressure outside the vapor phase curve to minimize the risk of Joule Thomson hydrocarbon dew point dropout in the form of condensation.
If such condensation occurs, the input to the analyzer/chromatograph may be fouled with liquid, the integrity of any obtained measurement compromised, and damage to the chromatograph from, for example, column bleed is likely. At best, the result is generation of false readings from ghost peaks and the like, and at worst, the analyzer will be rendered inoperable. Uneven flow and pressure drops during the liquid to vapor conversion may also result in false readings as well as decreased system operational accuracy and efficiency.
Accordingly, it is important to maintain the integrity of the liquid sample to the vaporizer and maintain the vaporized liquid sample with minimal pressure and temperature variation to avoid inaccuracies.
Turning to issues associated with vaporization itself, vaporization devices in which a low carbon number hydrocarbon liquid, such as natural gas liquid (NGL) and particularly cryogenic LNG, is vaporized by heating may suffer from development of temperature gradations proximate to a liquid sample entry port. In the case of such temperatures exceeding the heat of vaporization, pre-vaporization of the liquid sample may result. When an extracted liquid sample is subject to partial or complete vaporization proximate to the vaporizer input, but before reaching the flash vaporization chamber, the integrity of the vaporized sample exiting a vaporizer may be compromised by undesirable partitioning of product components (lights, intermediates, and heavies) separating and entering the vaporizer at different times. Such partitioning or separation will generally lead to faulty energy content and compositional analysis. Further, in the event that the pre-vaporized sample is exposed to subsequent cooling or pressure reduction causing partial re-condensation during the passage into the vaporization chamber, further undesirable compositional stratification/partitioning may result. Additionally, where pre-vaporization occurs at the vaporizer input, the cooling effect created by the expansion of the liquid to gas can generate exterior icing upstream of the entry port and thereby augment thermal anomalies which further compromise sample uniformity and integrity. Furthermore, it would be desirable to provide a liquid sample vaporizer and conditioning system with multiple pathways providing redundancy in the event of vaporizer failure to allow for remixing of the vaporized streams and continued operation even at reduced pressure and flow levels while maintaining sample integrity by preventing vaporized sample partitioning/condensation. Finally, it is very desirable to minimize start-up time for the system to stabilize and to assure adequate sample flow rates even at lower pressures for custody transfer operations.
Another issue arises in conventional prior art constructs. The vaporizing enclosure does not facilitate ease of replacement of heater cartridge elements because the elements are typically vertically mounted within the enclosure using welded tabs to secure the cartridge on a supporting plate platform and positioned within the coiled heat exchange tubing. Consequently, upon failure of a heater cartridge unit or compromised heating performance indicating replacement, disassembly and reassembly, in addition to time and labor requirements, entails a degree of difficulty requiring skill, and shutdown for an unnecessarily extended period.
Accordingly, continued needs exists for improved sample processing from take-off to analysis and improved and improved vapor enclosure assembly.
Illustrative, non-limiting embodiments of the present invention may overcome the aforementioned and other disadvantages associated with related art liquid gas vaporization and measurement systems.
It is an object of the present invention to provide an improved system and method for efficiently and accurately sampling and conditioning liquid gas vapor from a liquid sample.
It is an object of the invention to provide a reliable liquid sample vaporizer conditioning system that prevents pre-vaporization of a liquid sample while maintaining suitable temperature, pressure throughout the sample conditioning process to avoid Joule-Thomson condensation while maintaining adequate sample flow.
It is a further object of the invention to provide for enhanced sample pre-vaporization mixing and post vaporization mixing without condensation from pressure loss.
Still another object of this invention is to provide an improved explosion-proof vaporizer enclosure that provides for efficient modular mounting of heat exchange elements comprising coiled tubing wrapped heater cartridges that improve heat exchange, prolong the useful life of the heater cartridges and facilitates access for maintenance and replacement.
To achieve the above and other objects, an embodiment in accordance with the invention includes an improved vaporizer and conditioning system for liquid, including a sample input, a vaporizer operable to receive a liquid sample and convert the received liquid sample gas into vapor gas that is passed to an accumulator tank operable to receive the vaporized sample and a heated pressure regulator for conditioning the accumulated vaporized sample outputted from the accumulator tank to reduce the pressure thereof for passage to a downstream analyzer, the improvement comprising: a resistance temperature detector unit; a sweeping bend, a thermal break for minimizing heat energy transfer; a flow buffering input manifold, splitting the input into multiple outputs with reduced pressure drop and enhanced flow volume uniformity; a multipath vaporizer housing containing a select number of inputs and outputs corresponding to the number of outputs from the flow buffering input manifold and a heater cartridge unit associated with each input characterized by a) an electrically powered heater rod of a select length with an upper end and a lower end, b) coil tubing segment having a select height greater than the heater rod select length to extend above the upper end thereof, and spiral wrapping to minimize spacing between turns, maximize the contact surface area of the coil tubing with the heater rod, and minimize pressure drop across the coil tubing length, c) a thermocouple, disposed below the coil tubing segment and an output; an exit manifold incorporating inputs corresponding to the number of outputs from the vaporizer, each exit manifold input including a shutoff valve to terminate flow from its respective heater cartridge unit, said exit manifold including an interior accumulator chamber to mix the respective inputs into a common output stream, and an output for the common output stream from the interior accumulator chamber; an exit manifold thermocouple associated with the exit manifold outlet stream and a shut off valve for preventing flow when a temperature anomaly is detected by the exit manifold thermocouple, an accumulator tank for receiving the vaporized sample output from the exit manifold and outputting accumulated vaporized sample a heated pressure regulator for conditioning the accumulated vaporized sample outputted from the accumulator to reduce the pressure thereof for passage to a downstream analyzer.
Another embodiment of the invention includes an improved method of vaporizing and conditioning a liquid sample stream for analysis, the improved method comprising the steps of: detecting a liquid sample temperature with a resistance temperature detector; passing the liquid sample stream respectively through a sweeping bend, a thermal break and into a vaporizer input manifold to split the liquid sample stream into a select plurality of vaporizer input streams substantially identical in flow rate, pressure and temperature; outputting each of the select plurality of vaporizer input streams into a vaporizer enclosure with a number of vaporizing pathways corresponding to the select plurality, each vaporizing pathway comprising tubing with an upper liquid inlet and a lower vaporized gas output and a coiled intermediate section spirally wound about a heater cartridge to maximize the heat transfer contact area between said heater cartridge and the coiled intermediate section and a temperature detecting vaporized gas output thermocouple associated with the lower vaporized gas output; inputting the vaporized gas output into a vaporized gas mixing manifold with a plurality of inputs corresponding to the plurality of vaporizing pathways for receiving the output from the plurality of vaporizing pathways where each of the inputs is associated with a shutoff valve for terminating vaporized gas input to the manifold upon detection of a temperature anomaly by the vaporized gas output thermocouple, where the vaporized gas mixing manifold includes a mixing chamber and an outlet for the mixed vaporized sample; outputting the mixed vaporized sample from the vaporized gas mixing manifold through tubing including a thermocouple for detecting the temperature of the output mixed vaporizer sample, said thermocouple being associated with a solenoid controlled valve for terminating flow from the vaporized gas mixing manifold upon detection of a thermal anomaly exceeding a select threshold by the thermocouple; inputting the mixed vaporized sample into a sample accumulator; outputting the accumulated vaporized sample from the sample accumulator to a heated regulator to reduce the sample pressure while maintaining temperature of the accumulated vaporized sample and preventing Joule-Thomson condensation; and passing the accumulated vapor sample from the heated regulator for analysis of constituent components.
Other objects of the invention are provided by an improved explosion proof vaporizer enclosure comprising: a back wall, a top wall and a bottom wall; an upper inlet in the top wall; a lower outlet in the bottom wall; an angled mounting plate defining a front edge and back section affixed to the back wall proximate to the bottom wall, said mounting plate projection at an acute angle from the back wall relative to the bottom wall, said mounting plate including at least one receiving slot formed in the front edge with a tapered slot extending therefrom for a select distance in the direction of the back section; a continuous length of tubing passing through the inlet and defining a liquid input, a coiled section having a pitch to limit spacing gap between coils, said coiled section defining an elongated cylindrical passage of defined diameter and a first length, a lower segment generally orthogonally disposed to the coil elongated cylindrical passage, and a vapor output segment length passing through the lower outlet; a removable elongated heater cartridge with a top portion, a bottom portion and an electrically powered heating element disposed therebetween, said heater cartridge having a diameter corresponding to that of the elongated cylindrical passage where the heating element has a length less than that of the tubing coiled section and the bottom portion projects through the receiving slot of the angled mounting plate; and a releasable clamp for engaging the lower portion of the heater cartridge to secure the heater cartridge to the mounting plate where the vapor outlet segment of the tubing passes through the tapered slot of the mounting plate to the lower outlet in the bottom wall.
The improvements provided by the present intelligent control invention include enlarged vaporizer tubing diameter to minimize pressure drop for higher flow rates, a Resistance Temperature Detector (RTD) unit a sweeping bend to avoid pressure drop during passage through the measuring device a bypass for any liquid sample input possessing to much of a temperature variance, as detected by the RTD, an in-line thermal break to minimize heat transfer from and to prevent introducing a mixed phase sample introduced into the underlying vaporizer, a flow buffering input manifold, possessing an enlarged input mixing chamber that provides for enhanced uniformity of flow volume with reduced pressure drop, enhanced multi-path heater vaporizer construction with four heater units fed by the manifold output with multi-wrapped spiral coil tubing of enlarged diameter to minimize spacing between turns, maximize heat transfer from the heating rod to the sample passing through the coil while avoiding hot spots, and minimize pressure drop across the vaporizer length while also providing a capability for partial shutdown in the event of compromised heating or flow anomalies from a particular heater as detected by an associated thermocouple, without risk of flow loss/volume capacity beyond a permissible threshold.
The invention contemplates a system that has the capacity for being fully ‘Intelligent” relying on a PID control unit that is completely automated in the context of temperature, pressure and flow detection with corresponding solenoid shutoff valves actuatable upon detection of anomalous readings falling outside permissible thresholds and associated bypasses to entirely or partially redirect sample input out of the vaporizing and conditioning pathway.
Referring to the improved multi-path explosion-proof vaporizer enclosure assembly contemplated by the invention, it contemplates a more precise multipath structure that provides, prolonged cartridge life, spacing uniformity, modular component mounting, and ease of access not found in the prior art.
Exemplary, non-limiting, embodiments of the present invention are discussed in detail below. While specific configurations and dimensions are discussed to provide a clear understanding, it should be understood that any disclosed dimensions and configurations are provided for illustration purposes only. A person skilled in the relevant art will recognize that, unless otherwise specified, other dimensions and configurations may be used without departing from the spirit and scope of the invention.
As used herein “substantially”, “relatively”, “generally”, “about”, and “approximately” are relative modifiers intended to indicate permissible variation from the characteristic so modified. They are not intended to be limited to the absolute value or characteristic which it modifies but rather approaching or approximating such a physical or functional characteristic.
In the detailed description, references to “one embodiment”, “an embodiment”, or “in embodiments” mean that the feature being referred to is included in at least one embodiment of the invention. Moreover, separate references to “one embodiment”, “an embodiment”, or “in embodiments” do not necessarily refer to the same embodiment; however, neither are such embodiments mutually exclusive, unless so stated, and except as will be readily apparent to those skilled in the art. Thus, the invention can include any variety of combinations and/or integrations of the embodiments described herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms, “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the root terms “include” and/or “have”, when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of at least one other feature, step, operation, element, component, and/or groups thereof.
It will be appreciated that as used herein, the terms “comprises,” “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of features is not necessarily limited only to those features but may include other features not expressly listed or inherent to such process, method, article, or apparatus.
It will also be appreciated that as used herein, any reference to a range of values is intended to encompass every value within that range, including the endpoints of said ranges, unless expressly stated to the contrary.
As used herein “gas” means any type of vapor gas resulting from vaporization of a liquid.
As used herein “liquid” means any type of liquid including cryogenic liquids that may be subject to vaporization and analysis such as liquified natural gas and di-atomics including mixtures thereof, and non-cryogenic liquids including hydrocarbon containing liquid matter such as natural gas liquids, and equivalents
As used herein “connected” includes physical, whether direct or indirect, permanently affixed or adjustably mounted. Thus, unless specified, “connected” is intended to embrace any operationally functional connection.
In the following description, reference is made to the accompanying drawings which are provided for illustration purposes as representative of specific exemplary embodiments in which the invention may be practiced
In the following description, reference is made to the accompanying drawings which are provided for illustration purposes as representative of specific exemplary embodiments in which the invention may be practiced. The following illustrated embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It is to be understood that other embodiments may be utilized and that structural changes based on presently known structural and/or functional equivalents may be made without departing from the scope of the invention.
Given the following detailed description, it should become apparent to the person having ordinary skill in the art that the invention herein provides an improved liquid gas vaporization and conditioning system and a method thereof for providing significantly augmented efficiencies while mitigating problems of the prior art.
The aspects of the present invention will become more readily apparent by describing in detail illustrative, non-limiting embodiments thereof with reference to the accompanying drawings, in which:
In this illustrated prior art embodiment, the vapor gas enters accumulator P118 at the top and is carried via a tube P119 inside the accumulator, the vapor pressure is sampled from the accumulator tank P118 and removed through port P134 for analysis via tubing P120 near the top of accumulator tank P118. The PID controlled mass flow assembly P114 minimizes flow irregularities of the sample.
In the illustrated embodiment of
Each of the individual vaporizer units 228 are securely mounted within the enclosure 226 to bracket 702 by a tube clamp 811 which engages each of the respective cartridge bases 809 (See also
Following introduction of the vaporized sample to the accumulator 242 under normal operations, the mixed accumulator sample is them output from the accumulator 242 one of plurality of streams. As illustrated in
In the disclosed embodiment, either a PLC (programmable logic controller) controller or a PID (proportional-integral-derivative) control system 250 may be used to provide robust control over the connected components, improving response time and allowing for data logging. The encased PLC/PID control system 250 is affixed to the exterior cabinet and connected to the interior electrically controlled components including sensors, heaters, thermocouples, solenoid vales and flow meters either physically via hardwired connections or wireless communication technology via conventional signal receiving elements. Furthermore, the PLC/PID control system 250 allows for connection of phased solid-state relays to enhanced heater cartridge control in the vaporizer enclosure which in turn provides a benefit of prolonging cartridge life by avoiding energy pulsing due to its ability to control temperature in a limited range, e.g., +/−½° C. In the case of a PLC controller, when programmed appropriately, it will allow for a system soft start to prevent heater overshooting and system shock while also improving alarming function and enhancement of solid-state relays with a duty load indicator.
Examples of PLC/PID controllers usable in the context of the invention include PLCs of the Allen Bradley Micro800 Controller series from Rockwell Automation of Milwaukee, Wis. and PIDs from Oven Industries of Mechanicsburg, Pa., U.S. and Watlow of St. Louis, Mo., U.S. Upon receiving a signal of an operational anomaly indicated a system parameter (temperature pressure or flow rate) deviation beyond a select threshold or in the event of system power loss, the PLC/PID controller responds rapidly to automatically terminate flow, locally or globally, by energizing or de-energizing select solenoid-controlled valves and the mass flow controller 225.
Referring now to the more detailed illustrations,
Jumping to
Referring now to
To effectively convert the incoming liquid sample into vapor and minimize exposure of the actual heating element 808 contained in heater cartridge unit 228 to the enclosure interior, the coil tubing section 1227 has a select height greater than the length of each encircled heater cartridge comprising unit 228 to extend above the upper end 807 thereof to prevent exposure of the top of the heater cartridge. The tubing section is also spirally wrapped around the heater cartridge at a pitch to minimize spacing between turns, maximize the contact surface area of the coil tubing section 1227 with the heater cartridge to enhance heat exchange, and minimize pressure drop across the coil tubing length. Each of the vaporizer units 228 includes a lower projecting mounting section 809 extending from the heater element 808 below the heat exchange coiling which is engaged by removable tube clamp 811 to affix to the mounting bracket 702 in a respective slot 810. A bolt on, type J thermocouple 230 is disposed below the coil tubing section 1227 along the orthogonally projecting segment of the tubing 1230. The straight tubing segment 1230 ends at an obtuse angle bend (to avoid unnecessary pressure drop) leading to segment 232 that align with and passes through the vaporizer enclosure outlet 804.
The vaporizer unit mounting bracket 702 is detailed in
The enclosure structure, accordingly, provides for enhanced ease of access and simplified maintenance. In effect, it provides a modular construction where a heater cartridge element may be easily dismounted from the mounting plate 702 by loosening and removing the tube clamp 811 and sliding the unit through the slot 810. A replacement heater element cartridge may then be reinserted into the coiled tubing and secured through the slot 810 using the tube clamp 811.
As gas exits the output manifold 234, it travels through ¼ inch (0.635 cm) tubing through another thermocouple (not illustrated) associated with a manual shutoff valve 240 then through the cryogenic solenoid valve 241, the redundancy being incorporated to prevent any liquid, at all, from being introduced into the top of downstream accumulator device 242 of the type described in Applicant's prior art illustrated in
Comparative performance established by testing demonstrates the significant operational improvement provided by the present invention. In a comparative test using liquid nitrogen as a reference cryogenic fluid, which has a lower boiling point than cryogenic LNG, measurements were taken of 1) system startup time to achieve pressure dependent, stable vaporization temperature from ambient to cooling to −300° F. (−184° C.) as measured by the RTD , 2) the sample flow rate at the bypass mass flow controller, and 3) the pressure drop measured from the liquid sample input before the RTD to the input of the accumulator tank. Specifically, the test between the prior art and the embodiment of the present invention illustrated in
While various aspects of the present invention have been particularly shown and described with reference to the exemplary, non-limiting, embodiments above, it will be understood by those skilled in the art that various additional aspects and embodiments may be contemplated without departing from the spirit and scope of the present invention. Other aspects, objects and advantages of the present invention can be obtained from a study of the drawings, the disclosure and the appended claims.
The invention provides for a system resulting substantially greater control of the liquid sample vaporization process during conditioning for passage to an associated analyzer by improving steady state conditions exhibiting and better control of thermal conditions, a decrease in pressure drops across the system while maintaining volumetric flow and vaporization, even at very low sample pressures of down to 10 psi (69 kPa), below the approximately 14 psi (97 kPa) level commonly experienced in LNG bunkering ships. The invention also provides for intelligent performance allowing for faster start-up, avoiding shutdown to permit continuous performance even in the event of isolated detected anomalies. The invention not only provides operations at lower pressures but also versatility for large scale transfer operations, e.g., ship to shore, by providing substantially fully automated control desired by operators. Further the invention provides an improved vaporizer enclosure structure employing angled, modular heater cartridge units maximizing heat exchange, prolonging useful cartridge life. and providing for efficient maintenance and replacement.
Warner, Kevin, Paluch, William C., Querrey, Timothy L., Thompson, Kenneth O, Hartson, William
Patent | Priority | Assignee | Title |
Patent | Priority | Assignee | Title |
10107722, | Oct 29 2015 | Persimmon Technologies Corporation | In-line thermal isolator for liquid sample conditioning |
10613006, | Sep 24 2018 | Mustang Sampling, LLC. | Liquid vaporization device and method |
11144078, | Sep 23 2019 | Mustang Sampling, LLC | Adjustable multistage pressure reducing regulator |
11248735, | May 25 2021 | Mustang Sampling, LLC | In-line thermal break |
2665239, | |||
3609983, | |||
3661202, | |||
3933030, | Sep 09 1974 | Exxon Research and Engineering Company | System for continuous monitoring of the density of cryogenic liquids via dielectric constant measurements |
3976450, | Jan 02 1973 | Whittaker Corporation | Gas sample preparation system and method |
4296637, | Mar 28 1980 | Standard Oil Company (Indiana) | Method and apparatus for sampling hot homogeneous mixtures |
4974453, | Oct 19 1989 | UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE UNITED STATES DEPARTMENT OF ENERGY | Method and apparatus for nitrogen oxide determination |
5321984, | Nov 12 1992 | Graseby Holdings Corporation | Automatic sample control cart |
5343747, | Jun 08 1992 | Normalized relative humidity calibration | |
5363874, | Oct 08 1992 | Sentry Equipment Corp. | Automated sample conditioning module |
5505782, | May 31 1991 | Integrated delivery system for chemical vapor from non-gaseous sources for semiconductor proccessing | |
5544276, | Nov 30 1993 | Inficon GmbH | Miniature gas chromatograph with heated gas inlet fitting, heated tubing, and heated microvalve assembly |
5596154, | Sep 21 1995 | Exxon Chemical Patents INC | Dilution control method and apparatus |
5918595, | Dec 21 1995 | Maquet Critical Care AB | Method for vaporizing an anesthetic liquid and vaporizer operating according to the method |
6042634, | Apr 22 1998 | BACHARACH ACQUISITION CORP ; Bacharach, Inc | Moisture extractor system for gas sampling |
6408895, | Sep 13 1999 | Vapor control system for loading and unloading of volatile liquids | |
6827046, | May 17 2002 | GREENLIGHT POWER TECHNOLOGIES, INC | System and method for converting a liquid into a vapor |
6848502, | Dec 09 2001 | Conversion Gas Imports, L.P. | Method and apparatus for warming and storage of cold fluids |
6981850, | Sep 23 2004 | PRAXAIR TECHNOLOGY, INC; Halliburton Energy Services, Inc | Apparatus and method for producing a pressurized vapor stream |
7337616, | Apr 25 2003 | L'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude | System for sampling cryogenic liquids, and air separation unit provided with at least one such system |
9562833, | Mar 15 2013 | Mustang Sampling LLC | Composite gas sampling system |
20030228707, | |||
20060157392, | |||
20060201235, | |||
20070137318, | |||
20070204749, | |||
20090151427, | |||
20210063285, | |||
20210080363, |
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